Retractable blade utility knife



FIG. 1 is a front elevational view of a retractable blade utility knife showing my new design therefor;

FIG. 2 is a front elevational view thereof, shown with the hooked blade in an extended position;

FIG. 3 is a front elevational view thereof, shown with the straight blade in an extended position;

FIG. 4 is a perspective view of FIG. 3;

FIG. 5 is a top plan view of FIG. 3;

FIG. 6 is another front elevational view thereof; wherein the rear view is a mirror image thereof;

FIG. 7 is a bottom plan view of FIG. 6;

FIG. 8 is a left side elevational view of FIG. 6; and,

FIG. 9 is a right side elevational view of FIG. 6. 

The ornamental design for a retractable blade utility knife, as shown and described. 